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Phylogenetic Tree

Phylogenetic Tree. Classification and Taxonomy. Biology 11. Classification. Grouping of objects or information based on similarities Biological Classification- how biologists group and categorize extinct and living species

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Phylogenetic Tree

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  1. Phylogenetic Tree

  2. Classification and Taxonomy Biology 11

  3. Classification • Grouping of objects or information based on similarities • Biological Classification- how biologists group and categorize extinct and living species • Taxonomy is the field of biology concerned with identifying and classifying organisms

  4. Who am i? • I walk on all fours. • My body is stout with an arched back. • My body sparsely covered with coarse hairs. • My ears are disproportionately long, and my tail is very thick at the base and gradually tapers • I have an elongated head. • My mouth is small and tubular. • I like to dig with big sturdy claws. • Each toe bears a large, robust nail which is somewhat flattened and shovel-like, and appears to be intermediate between a claw and a hoof

  5. Aardvark!

  6. Why classify? • There are many different systems with obscure names for animals… some based on physical and behavioural characteristics • Some scientists would look at that same animal and describe it differently, making it nearly impossible to identify any organisms • Imagine going shopping in a grocery store that had no system for organizing food into categories… how long would it take for you to find something?

  7. Why is a system of classification needed? • Organize species into groups and discuss them • Show relationships between organisms • Identify new organisms and keep track of them • Accurately and uniformly name organisms • Prevents misnomers such as “starfish” and “jellyfish” that aren’t really fish. “Seahorse” is not a horse. • Humans are Homo sapiens • Uses same language (latin) for all names

  8. Early taxonomy Aristotle was the first taxonomist dividing organisms into land, sea, & air dwellers Linnaeusdeveloped the modern system of naming known as binomial nomenclature. Linnaeus grouped species according to shared physical characteristics

  9. Binomial nomenclature • Each organism has a two-part Latin name • The first half is the GENUS, which is common to several species, and the second half is theSPECIES name, unique to that particular organism. • Ex. All chickadees are in the Genus Pocile while individual types of chickadees will have their own species name like atricapillus.  Scientifically, a Black-capped chickadee will be called an Pocileatricapillus. • The two-part name is called the scientific name.

  10. Poecileatricapillus Poecilerufescenes

  11. Rules for naming organisms • Using binomial nomenclature • Genus name + species name • Genus name is capitalized, species name is not • Both names are in italics or underlined (if handwriting)

  12. Examples: Homo sapiens (Humans) • Feliscatus(House Cat)

  13. Taxonomy • The science of naming and assigning organisms to groups • Groups of similar organisms are called taxa (singular taxon) • There are EIGHT taxa within taxonomy

  14. Domain Very large/general group of organisms • Kingdom • Phylum • Class • Order • Family                • Genus • Species Very small/specific group of organisms

  15. Use your cell! • Using your cell phone, find the Taxons for one organism we have not talked about • Examples- Kangaroo - Gold fish - Wild Rose - Kiwi - Douglas Fir Tree

  16. Example of classification • Domain: Eukarya • Kingdom:    Animalia • Phylum:    Chordata • Class:        Mammalia • Order:        Primata • Family:        Hominidae • Genus:        Homo • Species:    sapien • Scientists would use the term Homo sapiento refer to humans.  In latinHomo sapienmeans “wise man”.

  17. These groups can be remembered using several mnemonics, for instance: • KINGDOM, PHYLUM, CLASS, ORDER, FAMILY, GENUS, SPECIES • Kids Play Catch Over Farmer Green’s Stable. • King Phillip Came Over For Good Spaghetti.

  18. Modern 6 Kingdom taxonomic system

  19. Kingdom monera divided • All prokaryotes belong to the kingdom Monera • Includes both Eubacteria and Archaebacteria • Archaebacteria live in harsh environments like very salty lakes; intestines of mammals; and hot, sulfur springs & may be autotrophs or heterotrophs • Eubacteria are “true” bacteria some of which cause disease

  20. Prokaryote vs Eukaryote

  21. Appendages

  22. Binary Fission

  23. Please make a chart

  24. Kingdom Eubacteria and Archaebacteria

  25. Kingdom Protista • Includes unicellular and a few simple multicellular eukaryotes • They have nuclei and membrane-bound organelles • Some are “plant-like”, some are “animal-like” • They may be autotrophic (ex. Euglena) or heterotrophic (ex. Amoeba)

  26. Kingdom Fungi • Include mushrooms, molds, mildews, yeast and many relatives • They are eukaryotic • They are absorptiveheterotrophs - they digest food using enzymes & then absorb it • Fungi act as decomposers or parasites in nature

  27. Kingdom Plantae • Stationary, autotrophic, multicellular, eukaryotes that photosynthesize and produce oxygen • Plantae include mosses, ferns, cone-bearing plants, and flowering plants

  28. Kingdom Animalia • Multicellular, eukaryotic and heterotrophic (that is, they rely on other organisms for their nourishment) • Most members can move from place to place • Include fish, birds, reptiles, amphibians, and mammals - also includes sponges, jellyfish, several phyla of worms, sea stars, insects and a host of other organisms

  29. The Chordates

  30. The Invertebrates

  31. Crash Course: Taxonomy: Life’s Filing Cabinet • Questions • Pg. 320 # 1 • Pg. 323 # 2, 3 • Pg. 325 # 3 • Pg. 329 #1-3

  32. How are Relationships Determined? • Phylogeny - Evolutionary history or similarities between modern and fossil organisms • Behavioral - similar behavioral patterns • Geographical - location of the species on earth • Development - similarities in developmental stages • Biochemistry - closely related species have similar DNA and similar chromosomal structure as well as similar proteins (eg. both humans and cats produce lactose, lizards do not)

  33. Comparing human proteins to other primates • For each primate listed, determine how many amino acids differ from the human sequence. Record those numbers. • Calculate the percent difference by dividing those numbers by 15 and multiplying by 100.

  34. Which primate is most closely related? Least closely related? • Construct a diagram of primate evolutionary relationships that most closely fits your results.

  35. Phylogeny- Evolutionary Histroy • Phylogenetic trees are branching diagrams showing how organisms are related • Organizes living things based on their evolution • Common ancestor is shown at the base of the tree - most modern organisms shown at tips of branches • Each time a branch divides into a smaller branch, it represents speciation

  36. Cladograms • Show relations based on characteristics such as feathers, hair, scales, etc.

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